125-200cc WR125 Top end apart: need advice (pics)

OK. I took a look at the topend today. The bike has 49.5 hours. Here are the pics of the piston and cylinder. Can you let me know what you think? From the looks of things, do I need rings, piston, cylinder damaged? Does the bike look too rich or lean.

I plan on a new piston and rings at the least, but am curious if I even need a new piston. Maybe clean the carbon deposits and slap on a new ring?

I have not tested the compression, because I do not have a tester. Need to get one.

thanks
JS

I think it looks good for 50 hours. Look more like 5 hours to me. See the little band in the center of the ring? That's the only part that's wore in. It looks like you could have gone much longer.

That's normally a lot of hours on a single ring 125, but it looks like you could throw a ring on it and go another 50 hours.

Just my two cents.

Thanks! I should mention that it probably only has about 10-15 hours of real hard on the pipe riding (when I ride it). The rest of the hours were spent at a flowing and mellow pace on single and double track by my wife. She started to get on the pipe the last few hours, then become pregnant...halting her riding for a bit

JS

oh no, the wr can make chicks pregnant?!?'

:P congrats man, hope everything will go okay

im no 2stroke expert, but ive read alot of articles on break in, doesnt it look like the ring hasnt sealed properly?

Wow I wouldn't touch that one with a ten foot,................

Seriously though,...what a way to weasel her bike away from her!
Congrats man!....

Anyone notice the two little holes on the front side of the piston?
We were just discussing that the other day.

man, i wish mine looked that good after 10 hours!

id just ring it, what was your compression?

when i ringed mine last summer i had 120 psi (way low) ringed it and brought it clear back to life!

Hi, thanks for the input! The ring is installed copper side up, not sure if that is correct. The only time the top end was removed was by the dealer to do the PV fix. Here are pics of everything. There is some wear on the piston skirt on the exhaust side. I am concerned about the carbon below the ring. It was easy to remove the wrist pin, and I do not see any blueing, but a bit of wear.

I am running 32/5th clip/450 main. After a really hard run on 3/4/5 gear double track I can smell hot coolant (the smell of the motor), but have never seen coolant flow out the overflow tube...and have smelled this on other bikes too.









JS

Haha. Were you given the "birds, bees, and 2-strokes" talk as a kid?

Sometimes extreme measures are needed to gain access to the preferred bike of the family!

JS

Honestly, I didn't want to offened anybody, but.....

so those are the holes in the piston ive never seen!

cool, i will be drilling my next pison!

Well. This is the only bike I have properly heat cycled, etc., etc.
The only thing is...not sure what happened at the dealer before I got the bike. The cylinder was removed for the PV fix, he did "test" ride it. Maybe he put too much oil on the ring, or road it hard, or road it lean?

What do you do for break in? Suggestions are welcomed.

JS

Thanks for the help. I am going to through a ring on it, run it for another 10 hours and see how it looks then. I am curious if it will have even more torque and hp with the ring properly seated.

Then throw on the 144 kit in the summer, yeah!

JS

JS,

Your piston looks great. Clean the carbon off the top, throw a new ring in it and ride it another 50 hours. I will be getting one of the OEM 144 kits from Kelly shortly and report on how it compares.

Walt

PS, If you decide to just bore out your existing jug, just send it to George at Uptite. He is close to you and does great work.

No, No, it's fine. It just looked like it had hardly been rode. I wanted to say, "Dude, you ride like a girl". Then you explained it was your wifes bike.

If it was my bike, I'd wipe the bore down really good with a contact type cleaner to get some of the glaze off the bore. Pop on a new ring and put it together bone dry. I'd keep the plug out, ground it and kick it over about a dozens times as hard as I could.

Then I'd put the plug in, fire it up with as little choke as I could get away with and not let it idle, reving it pretty hard until good and warm. Let it cool a bit then ride it like I stole it.

no pics anymore